- Researchers studied the effects of drinking different types of tea — such as green tea, oolong tea, and black tea — on diabetes risk.
- They found that drinking 1-3 cups of tea slightly reduced the risk of developing type 2 diabetes, but drinking 4 or more cups of tea per day was associated with a 17% lower risk.
- However, more study is needed to confirm the results.
According to the World Health Organization, about
Some studies have found that consuming
Further study of the effects of tea and dose on diabetes risk in large populations could inform preventive diabetes care strategies.
Recently, researchers conducted a meta-analysis of 19 cohort studies from eight countries to investigate the effects of black, green, and oolong tea consumption on the risk of type 2 diabetes.
They found that drinking 4 or more cups of tea per day may reduce the risk of developing diabetes.
Drinking tea does not appear to be harmful and may confer a small benefit in reducing diabetes risk. Dr. Kashif Mohamed Mounir،, an assistant professor of medicine at the University of Maryland Diabetes and Endocrinology Center, who was not involved in the study, said Medical news todayOther foods high in polyphenols have shown similar effects.
A meta-analysis was presented in European Association for the Study of Diabetes Annual meeting in Stockholm, Sweden.
For the study, researchers analyzed data from 5,199 adult participants from China Health and Nutrition Survey. Participants were not diabetic at the start of the study and were followed from 1997 to 2009. Their tea consumption was collected from questionnaires.
In all, 45.76% of the participants reported drinking the tea, and 10.04% of the group developed type 2 diabetes during the study period.
After adjusting for factors including age, gender and lifestyle, the researchers found that tea drinkers had an increased risk of type 2 diabetes for those who did not drink tea.
Next, the researchers conducted a systematic review of 19 cohort studies with 1,076,311 participants that investigated the link between the risk of type 2 diabetes and tea consumption.
They were able to explore the relationship between type 2 diabetes risk and consumption of different types of tea – including green tea, oolong tea, and black tea, tea drinking frequency, gender, and living area.
Researchers found that those who drank 1-3 cups of tea per day had a 4% lower risk of developing type 2 diabetes compared to non-drinkers.
However, those who drank at least four cups of tea per day had a 17% lower risk of developing type 2 diabetes compared to non-tea drinkers.
The researchers noted that their results remained regardless of tea type, gender, and living area. They noted that this suggests that the beneficial effects of tea on diabetes risk may be related to the amount consumed, unlike other factors.
Dr. Mounir said in response to a question about how drinking tea can reduce the risk of type 2 diabetes:
“Tea is known to contain dietary polyphenols, such as EGCG, which have been shown to reduce insulin resistance and improve endothelial function ([which is] Important for regulating the immune response, blood clotting, and dilation or constriction of blood vessels. These effects may have beneficial effects on glucose homeostasis and improve diabetes risk. “
Black tea may also prevent obesity – a risk factor for diabetes – by promoting
The researchers concluded that daily tea consumption may reduce the risk of type 2 diabetes.
When asked about study limitations, Professor Peter Cliftonan assistant professor of clinical and health sciences at the University of South Australia, who was also not involved in the study MNT Since this study was epidemiological in nature, it can only highlight possible links.
He added that randomized, double-blind trials of dried tea extract in capsules versus placebos would need to be monitored over several years to obtain conclusive results.
“Suggesting drinking tea or drinking coffee as a lifestyle intervention will not work because people will not suddenly change their inherent tea drinking habits. Therefore, there is no reason to give it up but there is not a lot of evidence to take it.”
Professor Peter Clifton
Dr. Mounir added that the initial smaller study did not show a benefit from tea consumption because noticing small effects in a large population often requires a larger number of participants.
The meta-analysis included more than 1 million participants from 19 studies and showed benefits with higher levels of tea consumption associated with a lower risk of diabetes. Larger studies, such as this one, are often needed to derive a small benefit from a particular food.
He concluded, “However, the limitations are that we don’t know whether food is causal or simply an association with lower rates of diabetes and many biases may interfere with nonrandomized studies.”